* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: white;
  color: #333;
}

header {
  background-color: #ff5733;
  padding: 20px 0px;
  color: white;
  text-align: center;
}

.support_link {
  margin-top: 80px;
  margin-left: 65px;
}

.update_link {
  margin-top: 2px;
  margin-left: 65px;
}

#errorBox {
  display: none;
  background-color: #ffdddd;
  color: red;
  border: 1px solid red;
  padding: 20px;
  margin: 5px 0;
  border-radius: 25px;
  position: relative;
  opacity: 0;
  transform: translateY(-10px);
  font-size: 20px;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}
.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(0, 0, 0, 0.1);
  border-top: 5px solid #ff3d00;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.hidden {
  display: none;
}

.menu_button {
  background: none;
  border: none;
  display: none;
}

header h1 {
  margin-bottom: 30px;
  margin-right: 100px;
}

nav ul {
  list-style: none;
}

nav ul li {
  display: inline-block;
  margin-right: 60px;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

nav ul li a:hover {
  text-decoration: underline;
}

header .user_profile_photo img {
  margin-right: 20px;
  margin-top: 10px;
}

.logo_white {
  float: left;
  margin-top: -10px;
}

.menu_button {
  background: none;
  border: none;
  display: none;
}

.about-title {
  color: #ff5733;
  margin-top: 50px;
  font-size: 35px;
}

h4 {
  color: #ff5733;
  font-size: 33px;
  margin-top: 10px;
  margin-left: 40px;
}

.text_about_team {
  font-size: 19px;
  margin-left: 65px;
  margin-top: 33px;
}

.proje_amac {
  color: #ff5733;
  font-size: 30px;
  margin-top: 50px;
  margin-left: 40px;
}

.text_about_project {
  font-size: 19px;
  margin-left: 65px;
  margin-top: 35px;
}

.isletme-bilgi {
  color: #ff5733;
  font-size: 30px;
  margin-top: 50px;
  margin-left: 40px;
}

.text-business {
  font-size: 19px;
  margin-left: 65px;
  margin-top: 35px;
}

.developer {
  margin-top: 60px;
  margin-left: 65px;
}

.github_link {
  color: #333;
  font-size: 17px;
  margin-top: 100px;
}

.youtube {
  color: #333;
  font-size: 17px;
}

.twitter {
  color: #333;
  font-size: 17px;
}

.email {
  color: #333;
  font-size: 17px;
}

.search_button {
  background: none;
  border: none;
  margin-left: 1000px;
  margin-top: -150px;
  cursor: pointer;
}

.search_button:hover {
  background-color: #ff5733;
}

@media (max-width: 768px) {
  header h1 {
    visibility: hidden;
  }

  header h1::after {
    content: "SGSE";
    visibility: visible;
  }

  .logo_white {
    display: none;
  }

  header nav ul {
    position: absolute;
    margin-top: 0px;
    margin-left: 0px;
    width: 100%;
  }

  header ul {
    display: none;
  }

  header nav ul li {
    background-color: #333;
    padding: 10px;
    display: block;
    margin: 0;
    padding: 0;
    width: 100%;
  }

  header a {
    display: inline-block;
    font-size: 20px;
    padding: 5px;
  }

  .menu_button {
    display: block;
    margin-top: -65px;
    float: right;
    margin-right: 20px;
  }

  header nav ul li a {
    color: #e3651d;
  }

  header h1 {
    margin-top: -100px;
    padding-top: 35px;
  }
}